Regulated High Voltage Power Supply - del20032

This is a regulated AC power supply. This
circuit uses the Mosfet to turn off when voltage
goes beyond a reference point. That means it just
chops the Sine wave above a point.It implies that
the output may not be pure sine and may have
harmonics. The Transformer if well designed may
smoothen the chops. Even a Series Inductor or
Resonant Circuits may reduce harmonics.

This circuit will not work out of the box, i may
have made mistakes in documentation. The final
working design was not recorded in this schematic.
If you are an expert and understand concepts well,
try it out.

The opto coupler 4N50 Provides isolation and good
Current Transfer Ratio. That may mean you may not
get a shock and that even a small current signal in
Opto-LED will give a saturated or Low Impedance in
Opto-Transistor. The Mosfet is used like a
Impedance Control switch turned On-Off by Opto. The
Optocoupler diode is controlled by
the Opamps which work Closed loop. The
transformer output is compared with reference to
drive opto-led.

This Circuit is based on Teledyne Solid State data
book application note. They may not be making these
parts anymore but they are available from others.

This concept of control can be even used for
Hi-Frequency convertor, but we need to convert to DC
before chopping and a PWM Sine Shaper has to be
integrated. This circuit could be a replacement for
CVT - Constant Voltage Transformer OR Servo
Stabilizer. This circuit is more a Solid State Mains
Voltage Stabilizer for lower power gadgets.

In case you have many 110V AC Equipment but the
Mains Supply in your place is 220 V AC, then you
could use this both for isolation, protection and
regulation. Then you need to modify the design above
from a Boost or Step-up Regulator to a Buck or
Step-down Regulator. Note that this is a Low
Frequency Switcher and even Thyristor Based designs
like these existed.